Reginald a



R. A. FESSENDEN.

METHOD OF AND APPARATUS FOR OBTAINING INCREASED CIRCULATION.

APPLICATION FILED MAY 25. 1918.

1,318,740. IzItentmI 0ct.14,1919.

BE l5 /Z L J ATTORNEY.

WITNESS:

UNITED STATES PATENT OFFICE.

REGINALD A. FESSENDEN, OF BROO KLINE, MASSACHUSETTS, ASSIGNOR TO SUBMABINE SIGNAL COMPANY, OF PORTLAND, MAINE, A CORPORATION OF MAINE.

METHOD OF AND APPARATUS FOR OBTAINING INCREASED CIRCULATION.

Specification of Letters Patent.

Patented Oct. 14, 1919.

Application filed Kay 25, 1918. Serial No. 286,558.

To all whom it ma 1 concern.-

- Be it known that I. REGINALD A. Fnssnn- DEN, a citizen of the United States, residing at Brookline, in the county of Norfolk and State of Massachusetts, have invented new and useful Improvements in Methods of and Apparatus for Obtaining Increased Circulation, of which the following is a specification.

My invention relates to the flow or movement of bodies of one kind in a medium of a different nature and more especially to circulation in fluids, and has for its object the increasing ofthe efliciency and velocity of such circulation.

Figures 1 and 2 show, partly diagrammatically, means for carrying out my invention.

In Fig. 1, 11 is a tank filled with a fluid to the level 17. 12 is a means for producing compressional elastic waves in said fluid, consisting preferably of an oscillator of the type described in U. S. Patent 1,167,366. 13 and 11 are the leads of the oscillator and 15 is the dynamo used for excitation.

In applying the invention to impregnating wood with a preserving fluid, the Wood to be impregnated, 18, is immersed in the preserving fluid in the tank 11 and the oscillator 12 being excited the compressional elastic waves generated in the fluid set up compressional elastic waves in the block 18' and increase the velocity of impregnation, presumably because the vibration of the cell walls of the wood increases the rate at which the air bubbles in the wood pass outward and the rate at which the impregnating liquid flows in.

Where the invention is to be applied to increasing the circulation of the human body, as for example by massage, the member to be treated, for example the arm 16, is inserted in the fluid in the tank-which in this case may be waterand on the oscillator being excited the compressional elastic waves transmitted through the water generate compressional elastic waves in the member to be treated, and such compressional elastic waves produce an increased circulation in the member and are found to produce other beneficial effects.

The application of the method to the manufacture of steel is shown in Fig. 2. Here 19 is the ingot mold filled with melted steel 20; 12 is the oscillator; 13 and 14 are the oscillator leads; 15 is the dynamo driving the oscillator; and 21 is the steel bar connecting the oscillator with the ingot mold.

Where the oscillator is not used the hubbles 22 formed in the melted steel do not escape from the steel quickly enough and form what is known as a pipe which greatly diminishes the amount of the steel castlng WhlCh is available for use, since the top containing the pipe has to be cut off and remelted.

When, however, the oscillator is used, as shown in Fig. .2, the compressional elastic waves cause the gas bubbles and other impurities to rise to the top before the steel gets so cool as to prevent their escape and consequently the size of the. pi e is'very greatly reduced and may be su stantially entirely absent, thereby rendering substantially the entire steel casting available for use.

It has been found by experiment that much better results are obtained when the oscillator is worked at certain definite frequencies.

the fact that when compressional elastic waves are generated continuously resonance effects are obtained. This would appear to be shown by the fact that when a block of wood is immersed, as shown in Fig. 1, at certain frequencies there is a. visible intense discharge of gas or vapor from the block, which is not obtained if a single compressional wave is caused to act upon it but only when a train of waves is used.

It has also been found advantageous to have the frequency high, even up to 10,000 or 40,000 per second, and the wave length short. Possibly, because in this case the compressional region of the waves is closely adjacent to the expansional region and con- The reason for this is not defi-' nitely known but it may be possibly due to sequently there is a much stronger tendency to circulatory movement, in contra-distinction to the case where the whole fluid is under compression or in expansion at the same- 5 instant or where the body of fluid is jarred in a medium of a different nature which 01 consists in generating sustained trains of compressional elastic waves in said medium.

2. Apparatus for increasing the circulation of fluids comprising a sustained source of compressional elastic waves in operative 51 relation to said fluid.

. REGINALD A. FESSENDEN. 

